516003421 has 2 divisors, whose sum is σ = 516003422. Its totient is φ = 516003420.

The previous prime is 516003403. The next prime is 516003427. The reversal of 516003421 is 124300615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 449906521 + 66096900 = 21211^2 + 8130^2 .

It is a cyclic number.

It is not a de Polignac number, because 516003421 - 2²¹ = 513906269 is a prime.

It is a super-3 number, since 3×516003421³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 516003392 and 516003401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (516003427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258001710 + 258001711.

It is an arithmetic number, because the mean of its divisors is an integer number (258001711).

Almost surely, 2^516003421 is an apocalyptic number.

It is an amenable number.

516003421 is a deficient number, since it is larger than the sum of its proper divisors (1).

516003421 is an equidigital number, since it uses as much as digits as its factorization.

516003421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 516003421 is about 22715.7086836401. The cubic root of 516003421 is about 802.0797039585.

The spelling of 516003421 in words is "five hundred sixteen million, three thousand, four hundred twenty-one".